Air spade



FIG. 1 is a front elevational view of an air spade showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the figures represent the bounds of the claimed design; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for an air spade, as shown and described. 